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    Mechanism for short guard interval indication in high efficiency WLAN
    13.
    发明授权
    Mechanism for short guard interval indication in high efficiency WLAN 有权

    公开(公告)号：US10979178B2

    公开(公告)日：2021-04-13

    申请号：US15794981

    申请日：2017-10-26

    Applicant: MEDIATEK INC.

    Inventor： Jianhan Liu ,  Tianyu Wu ,  Shengquan Hu ,  Thomas Edward Pare, Jr.

    IPC: H04L1/06 ,  H04L5/00 ,  H04L27/26 ,  H04L1/00 ,  H04W84/12

    Abstract: Systems and methods of expanding indication capabilities of existent PPDU preamble fields. The “GI+LTF Size” field is redefined to indicate a new combination of GI duration and HE-LTF size. The redefinition is indicated when the values of the two other existent fields, in combination, indicate an invalid scenario because the two values should have been mutually exclusive. Particularly, the DCM field and the STBC field are both set to the “enabled” mode as an indication for redefine the “GI+LTF Size” field. Upon receiving such a PPDU, a receiver is configured to resolve the PPDU as neither DCM nor STBC is enabled. Rather, the receiver interprets the particular combination of DCM and STBC values as an indication that the “GI+LTF Size” field is redefined to indicate the new combination of GI duration and HE-LTF size.

    Structured resource allocation signaling
    14.
    发明授权
    Structured resource allocation signaling 有权

    公开(公告)号：US10594462B2

    公开(公告)日：2020-03-17

    申请号：US15278031

    申请日：2016-09-28

    Applicant: MEDIATEK INC.

    Inventor： Tianyu Wu ,  Jianhan Liu ,  Shengquan Hu ,  Thomas Edward Pare, Jr.

    IPC: H04L5/00 ,  H04W72/04

    Abstract: Methods and apparatus are provided for structured resource allocation signaling. In one novel aspect, an 8-bit RU allocation filed is allocated in the HE-SIG-B common field for each 20 MHz. The structured resource signaling supports more than four MU-MIMO users. In one embodiment, the STA decodes the 8-bit RU allocation signal following a structured resource unit (RU) allocation rule, and determines the RU. In one embodiment, the STA decodes the first two bits of the 8-bit RU allocation signal to determine a first category of the RU allocation. The categories of the RU allocation includes a large RU size category indicating larger than or equal to 20 MHz RUs exist, a two 106-tone category indicating two 106-tone RUs exist, and a no-large-RU category indicating only smaller-than-242-tone RUs exist. The STA further decodes based on the category. A lookup table (LUT) for RU allocation is built and decoded based on a structured signaling rule.

    Beam-change indication for channel estimation enhancement
    16.
    发明授权
    Beam-change indication for channel estimation enhancement 有权

    公开(公告)号：US10187124B2

    公开(公告)日：2019-01-22

    申请号：US15283168

    申请日：2016-09-30

    Applicant: MEDIATEK INC.

    Inventor： Jianhan Liu ,  Shuling Feng ,  Thomas Edward Pare, Jr. ,  YungPing Hsu

    IPC: H04B7/02 ,  H04L27/26 ,  H04L25/02 ,  H04B7/06 ,  H04W84/12

    Abstract: A method of transmitting and receiving a HE PPDU and perform channel estimation enhancement is proposed. The HE PPDU comprises legacy preamble, HE-STF, HE-LTF, and data. A beam-change indication indicates if the pre-multiplied beamforming Q-matrix is changed from legacy preamble to H-SFT, HE-LTF, and data portion. A value of 1 indicates that Q matrix is changed. A value of 0 indicates that Q matrix is unchanged and receiver should be safe to combine L-LTF and HE-LTF. The beam-change indication can be used to significantly enhance channel estimation at receiver. When there is no beam-change, receiver does not change operation during HE-STF and HE-LTF such that the channel estimations can rely on the combination of L-LTFs, L-SIG, RL-SIG, HE-SIGAs and HE-LTF.

    Efficient preamble design and modulation schemes for wake-up packets in WLAN with wake-up radio receivers
    18.
    发明授权
    Efficient preamble design and modulation schemes for wake-up packets in WLAN with wake-up radio receivers 有权

    公开(公告)号：US12207196B2

    公开(公告)日：2025-01-21

    申请号：US18220126

    申请日：2023-07-10

    Applicant: MEDIATEK INC.

    Inventor： Jianhan Liu ,  Po-Yuen Cheng ,  Thomas Edward Pare, Jr.

    IPC: H04W52/02 ,  H04L27/04 ,  H04W84/12

    Abstract: Systems and methods of transmitting and receiving a Wake-Up Radio (WUR) packet by using a simplified preamble structure that contains no training field. The preamble carries a signature sequence selected from a set of predefined sequences, each corresponding to a different data transmission rate. The preamble and the control information of the WUR packet are transmitted in the same rate as indicated by the selected sequence. Hence, a receiving WUR can determine the data transmission rate and locate the associated control information directly if a sequence that matches a predefined signature sequence is detected. The same sequence or in combination with an additional sequence in the preamble may also be used to indicate automatic gain control synchronization, packet type and other related information.

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